added ZK plugin

1 files changed, 110 insertions, 0 deletions

diff --git a/config/nvim/lua/theme/colors256.lua b/config/nvim/lua/theme/colors256.lua
new file mode 100644
index 0000000..350a2a1
--- /dev/null
+++ b/config/nvim/lua/theme/colors256.lua
@@ -0,0 +1,110 @@
+-- Hex to 256 color conversion utilities
+
+local M = {}
+
+-- Convert hex color to RGB values
+local function hex_to_rgb(hex)
+	hex = hex:gsub("#", "")
+	return {
+		r = tonumber(hex:sub(1, 2), 16),
+		g = tonumber(hex:sub(3, 4), 16),
+		b = tonumber(hex:sub(5, 6), 16),
+	}
+end
+
+-- Convert RGB to nearest 256 color index
+local function rgb_to_256(r, g, b)
+	-- Build full 256 color palette and find nearest
+	local palette = {}
+
+	-- Gray ramp (232-255)
+	for i = 0, 23 do
+		local gray = 8 + i * 10
+		palette[#palette + 1] = { r = gray, g = gray, b = gray, idx = 232 + i }
+	end
+
+	-- 6x6x6 color cube (16-231)
+	local values = {0, 95, 135, 175, 215, 255}
+	for ri = 0, 5 do
+		for gi = 0, 5 do
+			for bi = 0, 5 do
+				local idx = 16 + ri * 36 + gi * 6 + bi
+				palette[#palette + 1] = {
+					r = values[ri + 1],
+					g = values[gi + 1],
+					b = values[bi + 1],
+					idx = idx
+				}
+			end
+		end
+	end
+
+	-- Find nearest color (minimum Manhattan distance)
+	local min_dist = 100000
+	local nearest_idx = 15
+
+	for _, color in ipairs(palette) do
+		local dist = math.abs(r - color.r) + math.abs(g - color.g) + math.abs(b - color.b)
+		if dist < min_dist then
+			min_dist = dist
+			nearest_idx = color.idx
+		end
+	end
+
+	return nearest_idx
+end
+
+-- Convert hex color string to 256 color index
+function M.hex_to_256(hex)
+	if not hex or hex == "" or hex == "NONE" then
+		return nil
+	end
+
+	if type(hex) == "number" then
+		return hex -- Already a cterm color
+	end
+
+	local rgb = hex_to_rgb(hex)
+	return rgb_to_256(rgb.r, rgb.g, rgb.b)
+end
+
+-- Create highlight table with cterm colors from fg and bg hex colors
+function M.convert_theme_theme(theme)
+	local cterm_theme = {}
+	for group, hl in pairs(theme) do
+		local cterm = {}
+		if hl.fg then
+			cterm.fg = M.hex_to_256(hl.fg)
+		end
+		-- Include background colors
+		if hl.bg then
+			cterm.bg = M.hex_to_256(hl.bg)
+		end
+		if hl.sp then
+			cterm.sp = M.hex_to_256(hl.sp)
+		end
+		if hl.bold then
+			cterm.bold = true
+		end
+		if hl.underline then
+			cterm.underline = true
+		end
+		if hl.undercurl then
+			cterm.undercurl = true
+		end
+		if hl.italic then
+			cterm.italic = true
+		end
+		if hl.reverse then
+			cterm.reverse = true
+		end
+		if hl.standout then
+			cterm.standout = true
+		end
+
+		cterm_theme[group] = cterm
+	end
+	return cterm_theme
+end
+
+return M